<template>
  <div :class="wrapClasses">
    <template v-if="type !== 'textarea'">
      <div :class="[prefixCls + '-group-prepend']" v-if="prepend" v-show="slotReady"><slot name="prepend"></slot></div>
      <i :class="['iconfont', prefixCls + '-icon', 'icon-close-bg']" v-if="clearable && currentValue && !disabled" @click="handleClear"></i>
      <i :class="['iconfont', prefixCls + '-icon', icon]" v-else-if="icon" @click="handleIconClick"></i>
      <i :class="['iconfont', 'icon-search', prefixCls + '-icon']" v-else-if="search && enterButton === false" @click="handleSearch"></i>
      <span class="sh-input-suffix" v-else-if="showSuffix"><slot name="suffix"><i :class="['sh-icon iconfont', suffix]" v-if="suffix"></i></slot></span>
      <!-- <transition name="fade">
          <Loading v-if="!icon" />
      </transition> -->
      <input
        :id="elementId"
        :autocomplete="autocomplete"
        :spellcheck="spellcheck"
        ref="input"
        :type="type"
        :class="inputClasses"
        :placeholder="placeholder"
        :disabled="disabled"
        :maxlength="maxlength"
        :readonly="readonly"
        :name="name"
        :value="currentValue"
        :number="number"
        :autofocus="autofocus"
        @keyup.enter="handleEnter"
        @keyup="handleKeyup"
        @keypress="handleKeypress"
        @keydown="handleKeydown"
        @focus="handleFocus"
        @blur="handleBlur"
        @compositionstart="handleComposition"
        @compositionupdate="handleComposition"
        @compositionend="handleComposition"
        @input="handleInput"
        @change="handleChange" />
        <div :class="[prefixCls + '-group-append']" v-if="append" v-show="slotReady"><slot name="append"></slot></div>
        <div :class="[prefixCls + '-group-append', prefixCls + '-search']" v-else-if="search && enterButton" @click="handleSearch">
          <i class="iconfont icon-search" v-if="enterButton === true"></i>
          <template v-else>{{ enterButton }}</template>
        </div>
        <span class="sh-input-prefix" v-if="showPrefix"><slot name="prefix"><i :class="['sh-icon iconfont', prefix]" v-if="prefix"></i></slot></span>
    </template>
    <textarea
      v-else
      :id="elementId"
      :wrap="wrap"
      :autocomplete="autocomplete"
      :spellcheck="spellcheck"
      ref="textarea"
      :class="textareaClasses"
      :style="textareaStyles"
      :placeholder="placeholder"
      :disabled="disabled"
      :rows="rows"
      :maxlength="maxlength"
      :readonly="readonly"
      :name="name"
      :value="currentValue"
      :autofocus="autofocus"
      @keyup.enter="handleEnter"
      @keyup="handleKeyup"
      @keypress="handleKeypress"
      @keydown="handleKeydown"
      @focus="handleFocus"
      @blur="handleBlur"
      @compositionstart="handleComposition"
      @compositionupdate="handleComposition"
      @compositionend="handleComposition"
      @input="handleInput">
    </textarea>
  </div>
</template>
<script>
import { oneOf, findComponentUpward } from '../../../utils/assist'
import calcTextareaHeight from '../../../utils/calcTextareaHeight'
import Emitter from '../../../mixins/emitter'
import size from '../../../mixins/size'
import Loading from '../../loading'
const prefixCls = 'sh-input'

export default {
  name: 'Input',
  components: {
    Loading
  },
  mixins: [ Emitter, size ],
  props: {
    type: {
      validator (value) {
        return oneOf(value, ['text', 'textarea', 'password', 'url', 'email', 'date', 'number', 'tel'])
      },
      default: 'text'
    },
    value: {
      type: [String, Number],
      default: ''
    },
    placeholder: {
      type: String,
      default: ''
    },
    maxlength: {
      type: Number
    },
    disabled: {
      type: Boolean,
      default: false
    },
    icon: String,
    autosize: {
      type: [Boolean, Object],
      default: false
    },
    rows: {
      type: Number,
      default: 2
    },
    readonly: {
      type: Boolean,
      default: false
    },
    name: {
      type: String
    },
    number: {
      type: Boolean,
      default: false
    },
    autofocus: {
      type: Boolean,
      default: false
    },
    spellcheck: {
      type: Boolean,
      default: false
    },
    autocomplete: {
      validator (value) {
        return oneOf(value, ['on', 'off'])
      },
      default: 'off'
    },
    clearable: {
      type: Boolean,
      default: false
    },
    elementId: {
      type: String
    },
    wrap: {
      validator (value) {
        return oneOf(value, ['hard', 'soft'])
      },
      default: 'soft'
    },
    prefix: {
      type: String,
      default: ''
    },
    suffix: {
      type: String,
      default: ''
    },
    search: {
      type: Boolean,
      default: false
    },
    enterButton: {
      type: [Boolean, String],
      default: false
    }
  },
  data () {
    return {
      currentValue: this.value,
      prefixCls: prefixCls,
      prepend: true,
      append: true,
      slotReady: false,
      textareaStyles: {},
      showPrefix: false,
      showSuffix: false,
      isOnComposition: false
    }
  },
  computed: {
    wrapClasses () {
      return [
        `${prefixCls}-wrapper`,
        {
          [`${prefixCls}-wrapper-${this.sizes}`]: !!this.sizes,
          [`${prefixCls}-type`]: this.type,
          [`${prefixCls}-group`]: this.prepend || this.append || (this.search && this.enterButton),
          [`${prefixCls}-group-${this.sizes}`]: (this.prepend || this.append || (this.search && this.enterButton)) && !!this.sizes,
          [`${prefixCls}-group-with-prepend`]: this.prepend,
          [`${prefixCls}-group-with-append`]: this.append || (this.search && this.enterButton),
          [`${prefixCls}-hide-icon`]: this.append && !this.clearable,
          [`${prefixCls}-with-search`]: (this.search && this.enterButton)
        }
      ]
    },
    inputClasses () {
      return [
        `${prefixCls}`,
        {
          [`${prefixCls}-${this.sizes}`]: !!this.sizes,
          [`${prefixCls}-disabled`]: this.disabled,
          [`${prefixCls}-with-prefix`]: this.showPrefix,
          [`${prefixCls}-with-suffix`]: this.showSuffix || (this.search && this.enterButton === false)
        }
      ]
    },
    textareaClasses () {
      return [
        `${prefixCls}`,
        {
          [`${prefixCls}-disabled`]: this.disabled
        }
      ]
    }
  },
  methods: {
    handleEnter (event) {
      this.$emit('on-enter', event)
      if (this.search) this.$emit('on-search', this.currentValue)
    },
    handleKeydown (event) {
      this.$emit('on-keydown', event)
    },
    handleKeypress (event) {
      this.$emit('on-keypress', event)
    },
    handleKeyup (event) {
      this.$emit('on-keyup', event)
    },
    handleIconClick (event) {
      this.$emit('on-click', event)
    },
    handleFocus (event) {
      this.$emit('on-focus', event)
    },
    handleBlur (event) {
      this.$emit('on-blur', event)
      if (!findComponentUpward(this, ['DatePicker', 'TimePicker', 'Cascader', 'Search'])) {
        this.dispatch('FormItem', 'on-form-blur', this.currentValue)
      }
    },
    handleComposition (event) {
      if (event.type === 'compositionstart') {
        this.isOnComposition = true
      }
      if (event.type === 'compositionend') {
        this.isOnComposition = false
        this.handleInput(event)
      }
    },
    handleInput (event) {
      if (this.isOnComposition) return

      let value = event.target.value
      if (this.number && value !== '') value = Number.isNaN(Number(value)) ? value : Number(value)
      this.$emit('input', value)
      this.setCurrentValue(value)
      this.$emit('on-change', event)
    },
    handleChange (event) {
      this.$emit('on-input-change', event)
    },
    setCurrentValue (value) {
      if (value === this.currentValue) return
      this.$nextTick(() => {
        this.resizeTextarea()
      })
      this.currentValue = value
      if (!findComponentUpward(this, ['DatePicker', 'TimePicker', 'Cascader', 'Search'])) {
        this.dispatch('FormItem', 'on-form-change', value)
      }
    },
    resizeTextarea () {
      const autosize = this.autosize
      if (!autosize || this.type !== 'textarea') {
        return false
      }

      const minRows = autosize.minRows
      const maxRows = autosize.maxRows

      this.textareaStyles = calcTextareaHeight(this.$refs.textarea, minRows, maxRows)
    },
    focus () {
      if (this.type === 'textarea') {
        this.$refs.textarea.focus()
      } else {
        this.$refs.input.focus()
      }
    },
    blur () {
      if (this.type === 'textarea') {
        this.$refs.textarea.blur()
      } else {
        this.$refs.input.blur()
      }
    },
    handleClear () {
      const e = { target: { value: '' } }
      this.$emit('input', '')
      this.setCurrentValue('')
      this.$emit('on-change', e)
      this.$emit('on-clear', e)
    },
    handleSearch () {
      if (this.disabled) return false
      this.$refs.input.focus()
      this.$emit('on-search', this.currentValue)
    }
  },
  watch: {
    value (val) {
      this.setCurrentValue(val)
    }
  },
  mounted () {
    if (this.type !== 'textarea') {
      this.prepend = this.$slots.prepend !== undefined
      this.append = this.$slots.append !== undefined
      this.showPrefix = this.prefix !== '' || this.$slots.prefix !== undefined
      this.showSuffix = this.suffix !== '' || this.$slots.suffix !== undefined
    } else {
      this.prepend = false
      this.append = false
    }
    this.slotReady = true
    this.resizeTextarea()
  }
}
</script>
